Original description
RECOVERED FOOTAGE - CAMP FOREST GREEN
Investigators found this VHS tape near the 13th cabin. The footage appears to be just walking in the woods, but forensics detected a deliberate, low-visibility signal embedded within the tape.
You'll need to separate the signal from the video by writing a custom solution.
Sometimes, to find the truth, you have to look for what doesn't change.
Original hints
Hints are preserved as part of the record. Point costs refer to the original competition.
Hint 115 PTS ORIGINALLY
The noise is random and dynamic, but the signal is static. Find a way to 'cancel out' the noise.
Hint 235 PTS ORIGINALLY
Human eyes are far less sensitive to color shifts (Chroma) than brightness (Luminance). Investigate the YCbCr color space, the secret might be hiding in a chroma.
Hint 350 PTS ORIGINALLY
Write a script to isolate the Cb channel, apply a temporal median filter, and then use CLAHE (Contrast Limited Adaptive Histogram Equalization) to recover the QR pattern.